iPad won't pair with new iPhone 14 or ac book air

Bluetooth pairing an iPhone and a Mac or iPad is not supported. 

If you are attempting to use Handoff/Continuity or AirDrop, that does involve Bluetooth but the devices are NOT paired; Bluetooth just needs to be on and the devices in range of each other. The following may help with Handoff/Continuity issues: Use Continuity to connect your Mac, iPhone, iPad, and Apple Watch - Apple Support

Also see Share files between your Mac and Bluetooth devices - Apple Support

And see the information in: Bluetooth: Why can't I pair my iPhone or … - Apple Community

There is absolutely no need to 'pair' them via bluetooth. That's not supported. All you need is to be in proximity and signed in with the same Apple ID.

That’s correct. It’s not necessary. What are you trying to accomplish by pairing them.